And she took a barista class, also gaining a Queensland certificate in the Responsible Service of Alcohol, before advertising her services as a cleaner, barista and administrative assistant.

Last Thursday morning, she set out from her CBD apartment in Brisbane, dressed in dark long pants, a beige sleeveless shirt and ankle boots.

She carried a large patterned bag, in which she usually packed her lunch and text books, over her shoulder.

Sophie Collombet from France. Photo: Facebook.

Twenty four hours later she was found bloodied and lifeless in a park, less than one kilometre from her home.

A passerby found the 21-year-old in a rotunda at Kuripla Park, near the William Jolly Bridge, in South Brisbane shortly after 6am on Friday.

She was naked apart from five silver and gold rings on her fingers and a silver bracelet found on her wrist.

Her clothes and handbag have not yet been found, despite police divers twice searching the Brisbane River.

News Corp reported that Ms Collombet's boyfriend, living in France, had been able to identify the rings when images were released to the public.

Detective Inspector Rod Kemp said Ms Collombet was the victim of a brutal attack, although police were yet to determine whether she was sexually assaulted or robbed.

"We believe the cause of death is a brain injury from blunt trauma. It's a particularly aggressive attack," he said.

Inspector Kemp said Ms Collombet may have last been captured on CCTV footage walking alone in the inner city between 2am and 3am on Friday.

But he conceded the footage was extremely grainy, making the process of trawling through hours of security vision incredibly difficult for police.

Inspector Kemp said police were searching for persons of interest captured on CCTV footage near the park's rotunda.

"There are a number of persons we would like to speak to who were in and around the Kurilpa Park area on Thursday night and Friday morning," he said.

But no firm suspects have been identified.

"There's a lot more CCTV footage to be obtained and to be studied," he said.

It is understood Ms Collombet's devastated family are preparing to travel from France to Brisbane.

The 21-year-old arrived in Australia on a student visa in February last year.

Her flatmates, also international students, reported the 21-year-old missing on Monday after being unable to contact her over the weekend.

Ms Collombet is the fourth foreign student to be murdered in Brisbane in as many months, following the deaths of Korean students Eunji Ban and Min Tae Kim in November and December last year and Singaporean student Meena Narayanan just last week.

"It's disgusting ... for someone to be attacked in this manner is just disgraceful," Inspector Kemp said.

"Of course it's a concern to us and we're working around the clock to hopefully bring the person to justice ...

"It's imperative we catch this person."

Inspector Kemp has appealed for information from members of the public who may have been in or around Kurilpa Park on Thursday night or Friday morning.

"We're really seeking help from any witnesses or any persons that know anything about this. You can imagine how the family feel back in France, knowing their daughter has been murdered," he said.

In a statement, Griffith University said it was working with the French consulate to provide support to the family and counselling would be offered to Ms Collombet's friends at the university.

Foreign student murders in Brisbane

Eunji Ban was found murdered in parklands in Brisbane's CBD on November 24 last year. The 22-year-old left her Roma Street apartment at 4am Sunday to make the short walk to work at a nearby hotel where she was a cleaner. Her bloodied body was found in Wickham Park by a passerby just 20 minutes later. Brisbane teenager Alex Reuben McEwan has been charged with her murder, although criminal proceedings against the 19-year-old have been temporarily suspended because of the accused's mental health issues.

The body of Korean student Min Tae Kim was found in a shallow grave at an Algester property, in Brisbane's south, on December 19. Mr Kim allegedly met with his accused killer, Sanghyun Hwang, after posting an ad on a website to exchange between $A8000 and $A15,000 cash for South Korean Won. Mr Hwang, also from Korea, has been remanded in custody.

Singaporean student Meena Narayanan was found dead in a Brisbane hotel on March 24. Ms Narayanan, who was studying her masters in business at QUT, died from stab wounds at the Travelodge Upper Mount Gravatt. Indian national Senthill Kumar Arumugam, 31, was formally charged last Wednesday with her murder.

Anyone with information is asked to call Crime Stoppers on 1800 333 000.